Originally Posted by hyper1
i did the same as you with cp-e. I added the resonator.
I'm not an expert. But if you change the DP you might have a yellow engine light.
you might have to go with some tune to delete that yellow light.
Some tunes have an option to block the O2 CEL, or you can get this Can Tool from BMS, which can block/auto-clear it. Friend of mine has a Vishnu catted downpipe on his n55 and still got the O2 CEL, apparently the n55 is super sensitive.
BMS CAN Tool